I would start at the sink and replace the factory installed p-trap with parts from a local plumbing supply. I have found that when I need plumbing help a trip to Ferguson gives me the parts and all the suggestions on what to do. It may be cheaper than the fuel required to take the camper back to the dealer.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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